Concentrator.



' N. H. FREEMAN.

CON GEN TRATOR.

Patented Feb. 7, 1911. i 2 SHEETS-SHEBTI.

err in.

NAT H. FREEMAN, 0F BOULDER, COLORADO.

CONGEN'I'BATOR.

assess.

To all whom it may concern:

Be it known that I, NAT H. FREEMAN, a citizen of the United States, residing at Boulder, in the county of Boulder and State of Colorado, have invented certain new and useful Improvements in Concentrators; and

l do declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in concentrators of the class in which the concentrating surface is transversely inclined and subjected to a longitudinal vibratory movement for the purpose of stratifying the material upon the table and finally separating the values from the gangue, the gangue being discharged at the lower longitudinal edge of the table, while the concentrates or values are discharged at the rear extremity thereof or the extremity remote from the head, the latter being applied to the extremity where the material to be treated is delivered. In this class of concentrators the pulp containing the material to be treated is discharged upon the table at the upper side of the head extremity thereof; while wash water is delivered to the table also at the upper edge but rearwardly of the pulp discharge.

lln my improved construction, the concentrating surface of the table is provided with adjustable interrupted rifiles. In other words each riffie is composed of two members, there being a space between the two members of each riftie, the said spaces be ing arranged in a diagonal path commencing at a point near the upper edge and forward end of the table and extending diagonally thereacross, the opposite extremity of said path, being near the lower edge and near the rear extremity of the table. The rearwardly located members of the riifles diminish in length from the upper side of the table downwardly, that is to say the up permost member of the rearwardly located member is longest, while the other rifHes di minish in length downwardly, the lowermost of said members being the shortest. Hence Specification of Letters Patent.

Application filed. July 6, 1907.

Patented Feb. W, 1911..

Serial No. 382,546.

the forward extremities of these rearwardly located members are arranged in a line ex tending diagonally across the table. The forwardly located members of the said riffles are arranged in the reverse order, that is to say the uppermost riflle is the shortest, the lowermost riille the longest, while the other rifiies increase in length from the uppermost to the lowermost. These forwardly located rifi les extend from the head of the table rearwardly, their rearward extremities being arranged in a line extending diagonally across the table as hereinafter more fully explained in detail. By virtue of this ritHe arrangement, a number of grades of concentrates may be discharged from the rear extremity of the table, since the space between each two of the rearwardly located riflles, may catch a different grade of concentrates. In other words by virtue of my improved construction the concentrate discharge at the rear extremity of the table may be classified into any desired number of grades.

By virtue of the longitudinal adjustability of the riffles of my improved construction, the interruption between the two members of each rifiie may be located as desired between the forward and rear extremities of the table.

Having briefly outlined my improved construction, I will proceed to describe the same in detail reference being made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a top plan view of my improved concentrating table, suitable means for imparting the longitudi nal vibratory movement thereto being also illustrated. Fig. 2 is a rear end view of the table, showing the means for imparting the transverse inclination thereto. Fig. 8 is a sectional detail view illustrating the adjustability of the riftles, the parts being shown on a larger scale. Fig. 4L is a top plan view of the same. Figs. 5 and 6 are top and side views, respectively of one of the rifle sec tions still on a larger scale.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a concentrating table considered in its entirety. This table is suitably mounted to have a longitudinalireciprocatory movement. It is preferably mounted upon flat springs (5 (see Fig. 2) which extend upwardly and permit a suitable degree of longitudinal oscillation, as

the table is actuated by a pitman 7 connected with the crank 8 of a shaft 9 journaled in boxes 10. This shaft is provided with a flv wheel 12 which may be connected with any suitable power for operating the table. The

springs (5 are mounted on a stationary sup port 13. To one side of this support is connected arod 14: connected with a stationary support by a ball and socket joint 15. The

upper portion of this rod is threaded as vided with a wheel 19 having a crank 19* to facilitate the manipulation of the rod for the purpose of adjusting the table transversely or regulating its transverse inclination.

Mounted at the head of the table and at the upper extremity thereof is a pulp box 20 Whose bottom is perforated to allow the pulp to pass to the concentrating surface of the table. In the rear of the pulp box 20 is located a wash water trough 21 for supplying the necessary wash water to the table for effecting the separation of the gangue from the values or concentrates. The concentrating surface of the table is provided with a series of interrupted or divided riffles, that is to say each rifle consists of two sections A and B in longitudinal alinement. The section A is the forward section of each rifle, while the section B is the rearward section thereof. Between the membersof each rifle is left a space 0, the spaces C being diagonally arranged across the table from the head toward the foot. The sections or members A of the rifles increase in length from the uper part of the table downwardly, while the sections B diminish in length from the upper portion downwardly.

It will be understood that the portion of the table containing the 'pulp box 20, and the wash water trough 21, is highest, while the table is downwardly inclined toward its lower edge 22 where the gangue is discharged. The longitudinal adjustment of the rifle members may be effected in any suitable manner. As shown in the drawing (see Figs. 3 and 4), the upper surface of the table is provided with a sheet of rubber 28 upon which the rifle members are placed. I Will assume in Figs. 3 and 4 the rifle member A is illustrated. The members A and B, however, are adjustable in the same manner so that the adjustability of one member need only be explained. Each rifle member is placed directly upon the rubber sheet 28,

and is held in the desired position of adjustment by a set bolt 24- threaded in the overhanging member .25 of a block 26 secured to the table by a screw 27. By loosening the bolt 24, the rifle member may be moved longitudinally at will. By virtue of this adjustment the location of the interruptions G diagonally across the table in a transverse direction, may be regulated at will.

From the foregoing description the use and operation of my improved concentrating apparatus will be readily understood. Assuming that the transverse inclination of the table has been properly regulated and also that the rifle members have been longitudinally adjusted according to the material which it is desired to treat, the table is subjected to a longitudinal reciprocating movement, the pulp to be treated being simultaneously fed to the upper left hand corner of the table (see Fig. 1), while the wash water is delivered to the table from the trough 21 rearwardly located from the pulp box 20. Under the influence of the longitudinal vibration of the table, the gangue is caused to travel transversely downwardly over the rifle members, while the values or concentrates are caused to travel rearwardly on the table or from left to right referring to Fig. 1. During the operation of the mechanism, the uppermost rifle member B, 9

will catch the heaviest concentrates, while the other members B in their order will catch different grades of concentrates, the concentrates caught by the various ri'llle members B, diminishing in gravity down wardly across the table. By virtue of llllS construction, each rifle catches a different grade of concentrates and all these grades or classifications are discharged at the rear extremity of the table. It is therefore evident that by the proper arrangement of the receptacles for the concentrates, there may be as many different grades or classifications as desired.

Having thus described my invention, what I claim is:

1. A transversely inclined longitudinally reciprocating concentrating table, provided with a series of longitudinally disposed riffies having interruptions intermediate their extremities, the said interruptions being arranged in a single path extending diagonally across the table from the head toward the foot and adjustable to regulate the width of the path, substantially as described.

2. A concentrating table provided with longitudinally disposed rifles provided with interruptions intermediate their extremities, the said rifle members being longitudinally adjustable and means for reciprocating the table for the purpose set forth.

3. A concentrating table provided with terruption being farthest therefrom and l'iiiles having interruptions intermediate means for reciprocating the table. 10 their extremities, the said rifile members be- In testimony whereof I aflix my signature ing longitudinally adjustable, interruptions in presence of two Witnesses.

of the various riflles being diagonally ar- NAT H. FREEMAN. ranged across the table from the head toward Vitnesses:

the root the uppermost interruption being DENA NELSON,

nearest the head of the table, the lower in- A. J. OBRIEN. 

